BMI Calculator
Calculate Body Mass Index with health range indicators
BMI Calculator divides your weight by your height squared (metric: kg / m², imperial: 703 × lb / in²) to give your Body Mass Index, your category (underweight, normal, overweight, obese per WHO thresholds), and the healthy weight range for your exact height.
Enter your height and weight, then calculate to see the full breakdown.
This tool gives general estimates for informational purposes only and isn't medical advice. Talk to a qualified healthcare provider about your individual health.
How to use BMI Calculator
- 1
Choose metric (kg, cm) or imperial (lb, inches) units.
- 2
Enter your weight and height.
- 3
Click "Calculate BMI" to see your BMI, category, and healthy weight range.
- 4
Switch units any time — the same figures are recalculated instantly.
Everything you need to know about BMI
What is BMI?
Body Mass Index is weight divided by height squared — a quick, widely-used screening number that places you into a general category (underweight, normal, overweight, obese) based on population statistics.
What BMI doesn't account for
BMI doesn't distinguish muscle from fat, so a very muscular person can show a "high" BMI despite low body fat, and it doesn't account for age, sex, or body composition. It's a useful general screening tool, not a diagnosis — talk to a healthcare provider for a fuller picture of your health, especially if your result surprises you.
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Frequently Asked Questions
What do the BMI categories mean?
Below 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30+ is obese, using the WHO's standard adult thresholds.
Is BMI accurate for everyone?
No — it's a quick screening ratio of weight to height, not a measure of body fat or fitness. It doesn't distinguish muscle from fat, so a muscular person can show a higher BMI without excess fat. It also isn't designed for children, who are assessed on age-and-sex growth charts instead.
How is the healthy weight range worked out?
By applying the normal-BMI boundaries (18.5 and 24.9) to your own height, so you get a weight range in kg or lb rather than just a single BMI number.
Does this tool send my numbers to a server?
Yes — your weight and height are sent to our servers to compute the result and the result is returned to you; we don't store the values.
Is this medical advice?
No. This is general information, not medical advice — speak to a doctor or other qualified health professional about your weight or health.